Sagging Sewage System Lines-- Filth variations can create your drain line to sag. When this happens, the segment which has sunk accumulates paper along with squander resulting in a blockage.????? ???? ????????? ?? ?????????? ???? ???????? ? ???????? ??? ??? ??????????, ?? ????????? ??? ??? ??? ???? ?? ?????????, ?? ??????? ?? ?????? ??? ?? ???????